Improvement in steam-boilers



lG. A. CLARK.

Steam-Boilers.

Patented .lun =.23`,1874.v

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CARLOS A. CLARK, OF BLOOMFIELD, IOWA.

IMPROVEMENT IN STEAM-BOILERS.

Specification forming part of Letters Patent No. 152,275., dated June 23, 1874; application tiled April 4, 1874. v

To all whom it may concern:

Be it known that I, CARLos A. CLARK, of Bloomfield, in the county of Davis and State of Iowa, have invented a new and useful Improvement in Tubular Steam-Boilers, ci' which the following is a specification:

The invention will first be fully described, and then pointed out in the claim.

In the accompanying drawing, Figure 1 is a vertical longitudinal section of the boiler taken on the line .fr .t of Fig. 2. Fig. 2 is a vertical cross-section of Fig. l taken on the line il il Similar letters of reference indicate corre- Y sponding parts.

A is the boiler. B is the furnace. C represents water-tubes. D D are steam domes or chambers above the generating-tubes C, being at opposite ends of the boiler, and connected by the steam-tubes E near their bottom, and by the steam-tube F at their top, so that the steam-pressure is equalized. G are vertical tubes at the back end of the boiler, (seen in Fig. 2,) with which the generatingtubes C connect. These tubes Gr discharge the steam from the generating-tube into the rear steam-dome D. H is the mud-box. The

sediment of the water settles from the tubes into this box, (which is in communication with the vertical tubes,) from which it is discharged by the blow-olif77 cock. The bridge-wall of the furnace is composed of vertical tubes J, which discharge into the forward dome D. The central portion of the generating-tubes (seen in dotted lines in Fig. 2) connect with the bridge-wall tubes. The crown and firebottom of the furnace consist of short tubes K L, which connect with the vertical tubes J, and with the tubular furnace-door frame M, which fra-me also communicates with the front dome D. The outside tubes C (at the right and left of the furnace) are attached to front corner tubes,'which also connect with the front dome.

For burning coal or fine fuel, a grate may be used over the bed-tubes of the furnace. The feed-pump may be attached to the mudbox or to any of the lower tubes ofthe boiler. The steam may be used from the upper tube F, or from either of the domes, as may be found most convenient.

The boiler will be surrounded by a suitable arch so that the tubes will be surrounded by the gaseous products of combustion. The water, being thus dividedup and brought into near contact with the lire and heat, will readily be converted into steam, which will tind its way into the steam-dome.

With this boiler fuel may be utilized to the greatest extent. No large body of water is to be heated, and danger of explosion is far less than with ordinary boilers.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- A boiler constructed with two steam-domes, D D, connected with each other by tubes E F, and with horizontal steam-generating tubes by vertical tubes J G, as and for the purpose specified.

CARLOS A. CLARK.

litnesses AMos STECKEL, B. T. ELLIOTT. 

